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https://www.readbyqxmd.com/read/29161293/high-intensity-focused-ultrasound-ablation-around-the-tubing
#1
Jun Yang Siu, Chenhui Liu, Yufeng Zhou
High-intensity focused ultrasound (HIFU) has been emerging as an effective and noninvasive modality in cancer treatment with very promising clinical results. However, a small vessel in the focal region could be ruptured, which is an important concern for the safety of HIFU ablation. In this study, lesion formation in the polyacrylamide gel phantom embedded with different tubing (inner diameters of 0.76 mm and 3 mm) at varied flow speeds (17-339 cm/s) by HIFU ablation was photographically recorded. Produced lesions have decreased length (~30%) but slightly increased width (~6%) in comparison to that without the embedded tubing...
2017: PloS One
https://www.readbyqxmd.com/read/29158513/microscale-cavitation-as-a-mechanism-for-nucleating-earthquakes-at-the-base-of-the-seismogenic-zone
#2
Berend A Verberne, Jianye Chen, André R Niemeijer, Johannes H P de Bresser, Gillian M Pennock, Martyn R Drury, Christopher J Spiers
Major earthquakes frequently nucleate near the base of the seismogenic zone, close to the brittle-ductile transition. Fault zone rupture at greater depths is inhibited by ductile flow of rock. However, the microphysical mechanisms responsible for the transition from ductile flow to seismogenic brittle/frictional behaviour at shallower depths remain unclear. Here we show that the flow-to-friction transition in experimentally simulated calcite faults is characterized by a transition from dislocation and diffusion creep to dilatant deformation, involving incompletely accommodated grain boundary sliding...
November 21, 2017: Nature Communications
https://www.readbyqxmd.com/read/29157879/the-snapping-shrimp-dactyl-plunger-a-thermomechanical-damage-tolerant-sandwich-composite
#3
Parvez Alam, Immanuel Sanka, Lilja Piuli Alam, Saka Wijaya, Erly Sintya, Niken Satuti Nur Handayani, Adolfo Rivero-Müller
The dactyl plunger of Alpheus sp. was found to be a layered composite, with mineral-rich outer and inner layers and a chitin-rich middle layer of high porosity. The chitin-rich middle layer is itself composed of several porous chitin laminae. Modelling heat conduction through the plunger cross-section revealed that the chitin-rich layer is able to insulate heat and retard its progress through the material. Heat accumulates in the plunger after a series of successive snaps and as such, its thermally resistant design can be considered most useful under the conditions of successive snapping...
November 7, 2017: Zoology: Analysis of Complex Systems, ZACS
https://www.readbyqxmd.com/read/29156450/current-indications-and-outcome-of-pulmonary-resections-of-tuberculosis-complications-in-ibadan-nigeria
#4
Mudasiru A Salami, Arinola A Sanusi, Victor O Adegboye
OBJECTIVES: To review the current indications and outcome of pulmonary resections for tuberculosis (TB) at the Cardiothoracic Surgery unit of the University College Hospital, Ibadan, Nigeria. SUBJECTS AND METHODS: A retrospective case series of patients who had lung resections from January 2014 to January 2017 was performed. Data obtained from medical records included demographics, presenting symptoms, indication for surgery, preoperative evaluation and preparation, operative procedure, post-operative complications and follow up...
November 16, 2017: Medical Principles and Practice: International Journal of the Kuwait University, Health Science Centre
https://www.readbyqxmd.com/read/29154094/ultrasonic-enhanced-fenton-like-degradation-of-bisphenol-a-using-a-bio-synthesized-schwertmannite-catalyst
#5
Xiang Li, Yongkui Zhang, Yi Xie, Yu Zeng, Panyu Li, Tonghui Xie, Yabo Wang
Schwertmannite (Sch) was synthesized by Acidithiobacillus ferrooxidans and used as Fenton-like catalyst for bisphenol A (BPA) degradation combining with ultrasonic technology (US). Physicochemical characterizations showed that the bio-synthesized Sch particles had a pompon-like morphology with high BET surface area of 92.92m(2)/g. The degradation reaction showed a two-stage pseudo-first-order kinetic process consisting of an induction period and a followed rapid degradation period. A synergistic effect existed between US and Sch on activating H2O2 and the synergy factor was calculated to be 2...
November 12, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29153914/determination-of-orientin-in-trollius-chinensis-using-ultrasound-assisted-extraction-and-high-performance-liquid-chromatography-several-often-overlooked-sample-preparation-parameters-in-an-ultrasonic-bath
#6
Mengxia Wei, Lei Yang
The erratic pressure intensities and cavitation exhibited in an ultrasonic bath pose various during practical application. To achieve the most efficient experimental design, this manuscript aims to discover violently sites that are subject to the effect of slight changes in position on cavitation and ultrasound intensity distributed in the ultrasonic bath. In addition, optimization several often over-looked ultrasound parameters and experimental conditions, are intended to place the reaction vessel properly and operate under suitable experimental conditions to obtain the maximum yield of target analyte...
November 15, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29152303/multiple-ultrasound-cavitation-enabled-treatments-for-myocardial-reduction
#7
Douglas L Miller, Xiaofang Lu, Chunyan Dou, Yiying I Zhu, Mario L Fabiilli, Gabe E Owens, Oliver D Kripfgans
Background: Ultrasound myocardial cavitation enabled treatment (MCET) is an image-guided method for tissue reduction. In this study, a strategy of fractionated (multiple) treatments was tested for efficacy. Methods: Dahl SS rats were anesthetized and prepared for treatment with a focused ultrasound transducer in a warm water bath. Aiming at the anterior left ventricular wall was facilitated by imaging with a 10 MHz phased array (10S, GE Vivid 7, GE Vingmed Ultrasound, Horten, Norway)...
2017: Journal of Therapeutic Ultrasound
https://www.readbyqxmd.com/read/29148219/breaking-free-from-vascular-confinement-status-and-prospects-for-submicron-ultrasound-contrast-agents
#8
REVIEW
Carly Pellow, David E Goertz, Gang Zheng
The development of encapsulated microbubbles (~1-6 μm) has expanded the utility of ultrasound from soft tissue anatomical imaging to not only functional intravascular imaging, but therapeutic interventions, with compelling studies of elicited biological effects. The large diameter of these bubbles has confined their utility to the vasculature, but converging interdisciplinary research pathways are giving rise to new submicron ultrasound contrast agents capable of extending their effects beyond the vascular compartment...
November 17, 2017: Wiley Interdisciplinary Reviews. Nanomedicine and Nanobiotechnology
https://www.readbyqxmd.com/read/29145482/combination-of-ultrasound-and-rtpa-enhances-fibrinolysis-in-an-in-vitro-clot-system
#9
Julia Masomi-Bornwasser, Philipp Winter, Hendrik Müller-Werkmeister, Susanne Strand, Jochem König, Oliver Kempski, Florian Ringel, Sven R Kantelhardt, Naureen Keric
BACKGROUND: Catheter-based lysis with recombinant tissue plasminogen activator (rtPA) is a well-established therapy for spontaneous intracerebral hemorrhage (ICH). The effectiveness of this therapy can be increased with ultrasound, but the optimal conditions are not yet clearly established. Using a novel in vitro system of blood clots previously developed by our group, we investigated various parameters of intralesional sonothrombolysis using an endosonography catheter in combination with rtPA...
2017: PloS One
https://www.readbyqxmd.com/read/29141316/-a-clinical-analysis-of-micafungin-treatment-of-pulmonary-invasive-fungal-infection-in-pediatric-patients-with-acute-leukemia-or-post-hematopoietic-stem-cells-transplantation
#10
K Huang, K Y Qiu, L L Deng, J P Fang, Y Li, H X Guo, D H Zhou
Objective: To investigate the efficacy and safety of micafungin (MCF) for pulmonary invasive fungal disease (PIFD) in pediatric patients with acute leukemia or post hematopoietic stem cells transplantation. Method: Twenty-five neutropenic PIFD children with acute leukemia or post hematopoietic stem cells transplantation in Sun Yat-sen Memorial Hospital of Sun Yat-sen University were selected from January 2012 to June 2015, including 12 males and 13 females, age range 2-15 (average 6.2±2.0) years. There were 12 cases of acute leukemia (AL) after chemotherapy, 4 cases of acute leukemia (AL) after allogeneic hematopoietic stem cell transplantation (allo-HSCT) and 9 cases of β-thalassemia major after allo-HSCT...
November 2, 2017: Zhonghua Er Ke za Zhi. Chinese Journal of Pediatrics
https://www.readbyqxmd.com/read/29141114/ph-ultrasound-dual-responsive-gas-generator-for-ultrasound-imaging-guided-therapeutic-inertial-cavitation-and-sonodynamic-therapy
#11
Qianhua Feng, Wanxia Zhang, Xuemei Yang, Yuzhen Li, Yongwei Hao, Hongling Zhang, Lin Hou, Zhenzhong Zhang
Herein, a pH/ultrasound dual-responsive gas generator is reported, which is based on mesoporous calcium carbonate (MCC) nanoparticles by loading sonosensitizer (hematoporphyrin monomethyl ether (HMME)) and modifying surface hyaluronic acid (HA). After pinpointing tumor regions with prominent targeting efficiency, HMME/MCC-HA decomposes instantaneously under the cotriggering of tumoral inherent acidic condition and ultrasound (US) irradiation, concurrently accompanying with CO2 generation and HMME release with spatial/temporal resolution...
November 15, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/29137800/passive-acoustic-mapping-of-cavitation-using-eigenspace-based-robust-capon-beamformer-in-ultrasound-therapy
#12
Shukuan Lu, Hong Hu, Xianbo Yu, Jiangying Long, Bowen Jing, Yujin Zong, Mingxi Wan
Pulse-echo imaging technique can only play a role when high intensity focused ultrasound (HIFU) is turned off due to the interference between the primary HIFU signal and the transmission pulse. Passive acoustic mapping (PAM) has been proposed as a tool for true real-time monitoring of HIFU therapy. However, the most-used PAM algorithm based on time exposure acoustic (TEA) limits the quality of cavitation image. Recently, robust Capon beamformer (RCB) has been used in PAM to provide improved resolution and reduced artifacts over TEA-based PAM, but the presented results have not been satisfactory...
March 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29137794/monitoring-the-effect-of-sonoporation-on-the-cells-using-electrochemical-approach
#13
Mohammad Ali Khayamian, Majid Baniassadi, Mohammad Abdolahad
Sonoporation is applied to enhance the permeability of the cell to bioactive materials by employing the acoustic cavitation of microbubbles. This phenomena would be helpful in molecular biology, delivery of large molecules into the cells and gene therapy. Many methods have been applied to monitor the biological effects and trace of sonoporation on the cells such as scanning/transmission electron microscopy, confocal imaging and flow cytometry. Here, we monitored the effect of sonoporation on the cells using electrochemical method with an integrated three electrode system...
March 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29137774/influence-of-reactions-heats-on-variation-of-radius-temperature-pressure-and-chemical-species-amounts-within-a-single-acoustic-cavitation-bubble
#14
Kaouther Kerboua, Oualid Hamdaoui
The scientific interest toward the study of acoustic bubble is mainly explained by its practical benefit in providing a reactional media favorable to the rapid evolution of chemical mechanism. The evolution of this mechanism is related to the simultaneous and dependent variation of the volume, temperature and pressure within the bubble, retrieved by the resolution of a differential equations system, including among others the thermal balance. This last one is subject to different assumptions, some authors deem simply that the temperature varies adiabatically during the collapsing phase, without considering the reactions heat of the studied mechanism...
March 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29137770/numerical-investigation-of-the-inertial-cavitation-threshold-under-multi-frequency-ultrasound
#15
Dingjie Suo, Bala Govind, Shengqi Zhang, Yun Jing
Through the introduction of multi-frequency sonication in High Intensity Focused Ultrasound (HIFU), enhancement of efficiency has been noted in several applications including thrombolysis, tissue ablation, sonochemistry, and sonoluminescence. One key experimental observation is that multi-frequency ultrasound can help lower the inertial cavitation threshold, thereby improving the power efficiency. However, this has not been well corroborated by the theory. In this paper, a numerical investigation on the inertial cavitation threshold of microbubbles (MBs) under multi-frequency ultrasound irradiation is conducted...
March 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29137749/exceptionally-high-cavitation-erosion-and-corrosion-resistance-of-a-high-entropy-alloy
#16
R B Nair, H S Arora, Sundeep Mukherjee, S Singh, H Singh, H S Grewal
Cavitation erosion and corrosion of structural materials are serious concerns for marine and offshore industries. Durability and performance of marine components are severely impaired due to degradation from erosion and corrosion. Utilization of advanced structural materials can play a vital role in limiting such degradation. High entropy alloys (HEAs) are a relatively new class of advanced structural materials with exceptional properties. In the present work, we report on the cavitation erosion behavior of Al0...
March 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29137742/ultrasound-coupled-with-supercritical-carbon-dioxide-for-exfoliation-of-graphene-simulation-and-experiment
#17
Yanzhe Gai, Wucong Wang, Ding Xiao, Yaping Zhao
Ultrasound coupled with supercritical CO2 has become an important method for exfoliation of graphene, but behind which a peeling mechanism is unclear. In this work, CFD simulation and experiment were both investigated to elucidate the mechanism and the effects of the process parameters on the exfoliation yield. The experiments and the CFD simulation were conducted under pressure ranging from 8MPa to 16MPa, the ultrasonic power ranging from 12W to 240W and the frequency of 20kHz. The numerical analysis of fluid flow patterns and pressure distributions revealed that the fluid shear stress and the periodical pressure fluctuation generated by ultrasound were primary factors in exfoliating graphene...
March 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29137737/acoustic-cavitation-in-1-butyl-3-methylimidazolium-bis-triflluoromethyl-sulfonyl-imide-based-ionic-liquid
#18
Slimane Merouani, Oualid Hamdaoui, Boumediene Haddad
In this work, a comparison between the temperatures/pressures within acoustic cavitation bubble in an imidazolium-based room-temperature ionic liquid (RTIL), 1-butyl-3-methylimidazolium bis(triflluoromethyl-sulfonyl)imide ([BMIM][NTf2]), and in water has been made for a wide range of cavitation parameters including frequency (140-1000kHz), acoustic intensity (0.5-1Wcm(-2)), liquid temperature (20-50°C) and external static pressure (0.7-1.5atm). The used cavitation model takes into account the liquid compressibility as well as the surface tension and the viscosity of the medium...
March 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29137735/superiority-of-sonochemical-processing-method-for-the-synthesis-of-barium-titanate-nanocrystals-in-contrast-to-the-mechanochemical-approach
#19
A Moghtada, R Ashiri
The results indicated that the ultrasonic sonochemistry which brings into play the acoustic cavitation phenomenon is more powerful and feasible in synthesizing the mixed oxides in contrast to the conventional solid-state approaches. The obtained results demonstrated that the sonochemical approach is able to obtain highly pure powder product at a much lower processing temperature of about 323K (50°C) in contrast to 1173K (900°C) which is essential for the synthesis by the mechanochemical approach. Sonochemical synthesis benefits from homogenous ordering the reactant ions (which have been dissolved in the solution mixture) into perovskite structure using ultrasonication...
March 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29135235/estimating-the-strength-of-single-chitin-nanofibrils-via-sonication-induced-fragmentation
#20
Yu Bamba, Yu Ogawa, Tsuguyuki Saito, Lars A Berglund, Akira Isogai
We report the mechanical strength of native chitin nanofibrils. Highly crystalline α-chitin nanofibrils were purified from filaments produced by a microalgae Phaeocystis globosa, and two types of β-chitin nanofibrils were purified from pens of a squid Loligo bleekeri and tubes of a tubeworm Lamellibrachia satsuma, with relatively low and high crystallinity, respectively. These chitin nanofibrils were fully dispersed in water. Strength of individualized nanofibrils was estimated using cavitation-induced tensile fracture of nanoscale filaments in a liquid medium...
November 14, 2017: Biomacromolecules
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